Tmobile Mobile Broadband sim in Samsung Vibrant

My daughter only uses her Samsung Vibrant for games and searching online, so she don't really need an add-a-line. Would a T-Mobile mobile broadband (data plan) sim work if I put it in her Vibrant? I searched online, and found many people claim it works, but I called T-Mobile twice and both time said it would not work. Are they saying this to prevent customers from using the data-only sims with their smartphones?
If this is indeed possible, it is said that the sim card must be activated correctly prior to putting it in the Vibrant. What exactly does that mean, and how do I do that? THANKS!!!

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